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Theorem difeq2d 3091
Description: Deduction adding difference to the left in a class equality. (Contributed by NM, 15-Nov-2002.)
Hypothesis
Ref Expression
difeq1d.1 (𝜑𝐴 = 𝐵)
Assertion
Ref Expression
difeq2d (𝜑 → (𝐶𝐴) = (𝐶𝐵))

Proof of Theorem difeq2d
StepHypRef Expression
1 difeq1d.1 . 2 (𝜑𝐴 = 𝐵)
2 difeq2 3085 . 2 (𝐴 = 𝐵 → (𝐶𝐴) = (𝐶𝐵))
31, 2syl 14 1 (𝜑 → (𝐶𝐴) = (𝐶𝐵))
Colors of variables: wff set class
Syntax hints:  wi 4   = wceq 1285  cdif 2971
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 104  ax-ia2 105  ax-ia3 106  ax-in1 577  ax-in2 578  ax-5 1377  ax-7 1378  ax-gen 1379  ax-ie1 1423  ax-ie2 1424  ax-8 1436  ax-11 1438  ax-4 1441  ax-17 1460  ax-i9 1464  ax-ial 1468  ax-i5r 1469  ax-ext 2064
This theorem depends on definitions:  df-bi 115  df-tru 1288  df-nf 1391  df-sb 1687  df-clab 2069  df-cleq 2075  df-clel 2078  df-ral 2354  df-rab 2358  df-dif 2976
This theorem is referenced by:  difeq12d  3092  phplem3  6389  phplem4  6390  phplem3g  6391  phplem4dom  6397  phplem4on  6402  fidifsnen  6405
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